#51507A
Closest named color: Dusk (#4E5481). oklch(45.1% 0.068 284.4), rgb(81, 80, 122).
Aa
White text reads best on this color (7.55:1).
About this color
#51507A is a medium-dark, muted purple. In OKLCH its lightness is 45%, its chroma 0.068 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.014 away. White text reads best on it, at 7.55:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.77:1 |
| White text | 7.55:1 |
Values
| HEX | #51507A |
| RGB | rgb(81, 80, 122) |
| HSL | hsl(241, 21%, 40%) |
| OKLCH | oklch(45.1% 0.068 284.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #51507A | 7.55:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #51507A | 2.77:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #51507A text on white | 7.55:1 | AAA | Lc 86.2 | Fine for body text |
| #51507A text on black | 2.77:1 | Fails | Lc -15.8 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F1
oklch(93.6% 0.011 286.2)
-
Step 200
200
#D7D7E8
oklch(88.4% 0.023 285.9)
-
Step 300
300
#BDBEDA
oklch(81% 0.039 283.9)
-
Step 400
400
#9B9CC8
oklch(70.8% 0.064 283.6)
-
Step 500
500
#8383B9
oklch(63.1% 0.081 283.8)
-
Step 600
600
#6D6CA5
oklch(55.6% 0.088 284)
-
Step 700
700
#5B5A8E
oklch(49.1% 0.082 283.8)
-
Step 800
800 (this color)
#51507A
oklch(45.1% 0.068 284.4)
-
Step 900
900
#3E3E5D
oklch(37.8% 0.053 283.6)
-
Step 950
950
#242436
oklch(26.9% 0.033 283.9)
#51507A with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #44557C | 0.022 |
| Deuteranopia (no green cones) | #425379 | 0.023 |
| Tritanopia (no blue cones) | #47585F | 0.060 |
| Achromatopsia (no color) | #545454 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51507A
#51507A
oklch(45.1% 0.068 284.4)
- #5B5727
#5B5727
oklch(44.9% 0.068 104.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #51507A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.014
- Dusty Grape #545775 ΔE 0.025
- Twilight #4E518B ΔE 0.028
- YInMn Blue #415A77 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.050
- Dusky Blue #475F94 ΔE 0.053
- Dusk Blue #26538D ΔE 0.059
Use #51507A in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.